And, despite Mourinho going up against Arsenal without Arsene Wenger in the opposite dugout for the first time, he still has a coloured history with the man who will be.
In 2010 the pair clashed as Real Madrid and Valencia managers after Mourinho made a list of complaints about the referee in one game.
Mourinho spouted about the injustice in his press conference and detailed 13 errors for the official, Carlos Clos.
“My team needs to be defended,” he said.
“If I say what I think I will be on the front pages and suspended. There is a club and a structure, and I want them to defend my team from there.”
Madrid had beaten Sevilla 1-0, but, then Valencia boss Emery was asked about it and took aim at Mourinho.
“We at Valencia have good reason to make a public complaint against all the mistakes that have led to us losing, but we do not,” he said.
“The position of Mourinho is that of a cry baby.”
After the match, Sevilla president Jose Maria del Nido said: “The pressure they (Real) put on the referee can be seen by the whole of Spain.
“It is a pre-meditated, coached and designed tactic but we already know what it is to play at the Bernabeu.”
Mourinho had a long-running feud with former Arsenal boss Wenger and famously called him a ‘specialist in failure’.
However his side are now scrapping about in mid-table and could find themselves 11 points behind the top four tonight if they lose to Arsenal.
They are already an incredible 19 points behind Manchester City after the win over Watford last night – the same distance they finished behind the champions last season when coming second in the table.
Mourinho yesterday performed a U-turn on claiming his side would be in the top four this month.
“Before the Crystal Palace game I told my hopes and targets were, by the end of December, to be in that position,” he said.
“The target changed, but in the sense of let’s try to close the distance as best we can and be very close to these positions.
“So I think it’s far from a miracle, we just need to not be so unlucky with problems that we have, we need some players to perform better than they are and we need to perform better as a team, but far from a miracle.”
Asked if he had to perform a miracle, he replied: “What? Nah.
“I don’t know if I say or if I didn’t but if I used that word is not what I feel at all.
“We have like eight or nine points from fourth something like that, I don’t think we need a miracle at all.
“We need a good run of results, not waste points we shouldn’t waste.”